Hi,
looks ok to me with exception being the Z. There i believe is better to use 2 pulleys and belt so you move the motor out of the wayof the Z plate. How much travel you achieve the way you have drawn it?

Also, if you have time, read in my signature build 1, how i made the Z moving plate. Basicaly you use 2 pieces of steel that raise the rails so the ballnut housing can pass freely and at the same time this makes the Z plate much stronger without additional hassle . That instead of making pocket for the ball screw, the way you have designed it. Not that its bad, simply what i say makes stronger Z plate


Also design it so that the spindle itself strengthens it , that why i think double bracket is better. SB here from the forum can make you 2 brackets for the price of 1.

Good Luck!